Finally working jtag config!
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Berkus Decker
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@ -7,7 +7,7 @@ bcm2835gpio_peripheral_base 0x3F000000
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# Transition delay calculation: SPEED_COEFF/khz - SPEED_OFFSET
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# These depend on system clock, calibrated for stock 700MHz
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# bcm2835gpio_speed SPEED_COEFF SPEED_OFFSET
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bcm2835gpio_speed_coeffs 146203 36
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bcm2835gpio_speed_coeffs 194938 48
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# Each of the JTAG lines need a gpio number set: tck tms tdi tdo
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# Header pin numbers: 23 22 19 21
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@ -17,4 +17,3 @@ bcm2835gpio_jtag_nums 11 25 10 9
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# Header pin numbers: TRST - 26, SRST - 12
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bcm2835gpio_trst_num 7
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reset_config trst_only
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@ -38,22 +38,22 @@ FUNC | GPIO | PIN # | MODE
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------+--------+---------+------
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TCK | GPIO25 | 22 | Alt4
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TMS | GPIO27 | 13 | Alt4
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TDI | GPIO4 | 7 | Alt5
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TDI | GPIO26 | 37 | Alt4
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TDO | GPIO24 | 18 | Alt4
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TRST | GPIO22 | 15 | Alt4
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GND | GND | 20 |
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```
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Connecting TDI to pin 7 (GPIO4) did not work!
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In config.txt:
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```
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# Set GPIO pins for JTAG debugger connection on rpi3
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gpio=22-25,27=a4
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gpio=4=a5
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# gpio23 RTCK - unused? Don't forget to avoid frequency scaling in this case.
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gpio=22-27=a4
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```
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Alternatively, just specify
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Alternatively, just specify @todo - verify this works with all alt4 pins
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```
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enable_jtag_gpio=1
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@ -66,7 +66,7 @@ Func | Host Pin | Wire color | Target pin
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-----+----------+------------+-----------
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TCK | 23 | yellow | 22
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TMS | 22 | brown | 13
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TDI | 19 | green | 7
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TDI | 19 | green | 37
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TDO | 21 | orange | 18
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TRST | 26 | red | 15
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GND | 20 | black | 20
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@ -77,66 +77,11 @@ GND | 20 | black | 20
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You need two files: interface file for driving the host GPIO correctly, and target file for detecting the JTAG circuitry on the target RPi.
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Interface configuration: rpi3_interface.cfg
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Interface configuration: [rpi3_interface.cfg](./rpi3_interface.cfg)
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```
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# Broadcom 2835 on Raspberry Pi as JTAG host
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[Source](https://movr0.com/2016/09/02/use-raspberry-pi-23-as-a-jtagswd-adapter/), [source #2 - rpi3 speed_coeffs](https://forum.doozan.com/read.php?3,21789)
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interface bcm2835gpio
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bcm2835gpio_peripheral_base 0x3F000000
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# Transition delay calculation: SPEED_COEFF/khz - SPEED_OFFSET
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# These depend on system clock, calibrated for stock 700MHz
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# bcm2835gpio_speed SPEED_COEFF SPEED_OFFSET
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bcm2835gpio_speed_coeffs 146203 36
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# Each of the JTAG lines need a gpio number set: tck tms tdi tdo
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# Header pin numbers: 23 22 19 21
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bcm2835gpio_jtag_nums 11 25 10 9
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# If you define trst or srst, use appropriate reset_config
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# Header pin numbers: TRST - 26, SRST - 12
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bcm2835gpio_trst_num 7
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reset_config trst_only
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```
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[Source](https://movr0.com/2016/09/02/use-raspberry-pi-23-as-a-jtagswd-adapter/)
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* @todo Find out about bcm2835gpio_speed_coeffs
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Target configuration: rpi3_target.cfg
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```
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# Broadcom 2835 on Raspberry Pi as JTAG target
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telnet_port 4444
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gdb_port 5555
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adapter_khz 1000
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transport select jtag
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if { [info exists CHIPNAME] } {
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set _CHIPNAME $CHIPNAME
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} else {
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set _CHIPNAME rspi
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}
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if { [info exists CPU_TAPID ] } {
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set _CPU_TAPID $CPU_TAPID
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} else {
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set _CPU_TAPID 0x07b7617F
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}
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jtag newtap $_CHIPNAME arm -irlen 5 -expected-id $_CPU_TAPID
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set _TARGETNAME $_CHIPNAME.arm
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target create $_TARGETNAME arm11 -chain-position $_TARGETNAME
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$_TARGETNAME configure -event gdb-attach { halt }
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```
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Target configuration: [rpi3_target.cfg](./rpi3_target.cfg)
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[Source #1](https://electronics.stackexchange.com/questions/249008/how-to-use-rpi-2-to-debug-rpi-model-b-via-jtag-with-openocd/419724#419724), [source #2](https://sysprogs.com/tutorials/preparing-raspberry-pi-for-jtag-debugging/), [source #3](http://openocd.org/doc/html/Reset-Configuration.html), [source #4](http://infocenter.arm.com/help/topic/com.arm.doc.faqs/ka3854.html), [source #5](https://www.raspberrypi.org/forums/viewtopic.php?p=1013802), [source #6 - proper rpi3 ocd config](https://www.suse.com/c/debugging-raspberry-pi-3-with-jtag/), [source #7 - simpler rpi3 ocd config](https://github.com/daniel-k/openocd/blob/armv8/tcl/target/rpi3.cfg), [source #8 - explanations about SRST](https://catch22.eu/baremetal/openocd_sysfs_stm32/)
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@ -6,11 +6,11 @@ gdb_port 5555
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transport select jtag
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# we need to enable srst even though we don't connect it
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reset_config trst_and_srst
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reset_config trst_only
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adapter_khz 1000
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jtag_ntrst_delay 500
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adapter_khz 500
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adapter_nsrst_delay 100
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jtag_ntrst_delay 100
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if { [info exists CHIPNAME] } {
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set _CHIPNAME $CHIPNAME
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